Adding a simple plasma example read write char short int, adding simulations

for this example

Examples/blink/logic/simulation/blink_TB.do

@@ -1,7 +1,7 @@
 vlib work
 vlog  +acc  "../blink.v"
 vlog  +acc  "../blink_TB.v"
-vlog  +acc  "/opt/cad/Xilinx/verilog/src/glbl.v"
+vlog  +acc  "glbl.v"
 vsim -t 1ps   -L xilinxcorelib_ver -L unisims_ver  blink_TB_v glbl
 view wave
 do wave.do